Combined type-writing and computing machine.



B. C. STICKNEY.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED MAR.23| 912.

1 1 86,520. I Patented June 6, 1916.

9 SHEETS-SHEET I.

WITNESSES: INVENTOR:

mwm m4 THE tOl-UMBIA Puuoallmn co., WASHINGTON, u. c.

B. C. STICKNEY.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED IAR.'23, I912.

Patented June 6, 1916.

9 SHEETSSHEET 2.

WITNESSES:

g mvunom rm: COLUMBIA PLANOIJRAPH c0.. WASHINGTON. D. cv

B. C. STICKNEY.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED MAR. 23, 1912- 1,1 86,520. Patented J une 6, 1916.

9 SHEETSSHEET 3.

INVEN TOR WITNESSE awa W4 B. C. STICKN EY. COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED MAR. 23. 191.2.

Patented J une 6, 1916.

9 SHEETS-SHEET 4.

R 0 T N E V N rm: COLUMBIA PLANOGRAPH C0,, WASHINGTON, n. c.

APPLICATION FILED MAR. 23.1912.

Patented J 11116 6, 1916.

9 SHEET SSHEET 5.

vLANoGRAPH co B. C. STICKNEY.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

Patented June 6, 1916.

9 SHEETSSHEET 6.

APPLICATION FILED MAR. 23. I2.

4 I l -m M \Mw\\\\ m" g x v w ?& Q w W fi w T w THE COLUMBIA PLANOGRAPN CO" WASHINGTON, I), c.

B. C. STICKNEY. C OMBINED TYPE WRITING AND COMPUTING MACHlNE.

APPLICATION, FILED MAR. 23.1912.

Patented June 6, 1916.

9 SHEETSSHEET 7- mu gab kwuuuuum h a g g NEE jw lggii gs $2 VTZWJA INVENTO R:

H: COLUMBIA PLANOGRAPH cm, WASHlNGTON, u c.

B. C. STICKNEY.

COMBINED TYPE WRITING AND COMPUTING MACHlNE.

APPLICATION FILED MAR. 23. 1912. v

1 ,1 86,520. Pgtented June 6, 1916.

9 SHEETSSHEET B- 'rms COLUMBIA PLANOGRAPH co., WASHINGTON, D. c.

B. C. STICKNEY.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED MAR. 23 I9I2.

Patented June 6, 1916.

9 SHEETS-SHEET 9- INVENTOR: W04

WITN ESSE THF. coummA PLANOGRAPH 50.. WASHINGTON, D. c.

UNITED STATES PATENT OFFICE.

IBURNHAM. C. STICKNEY, 0F ELIZABETH, NEW JERSEY, ASSIGNOR, BY MESNE ASSIGN- MEN'IS, T0 UNDERWOOD COMPUTING MACHINE COMPANY, OF NEW YORK, N. Y., A

CORPORATION OF NEW YORK.

COMBINED TYPE-WRITING AND COMPUTING IvIACHINE.

Application filed March 23, 1912.

To all whom it may concern:

Be it known that I, BURNHAM C. Snore sex, a citizen of the United States, residing in Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Combined Type-WVriting and Computing Machines, of which the following is a specification.

This invention relates principally to combined typewriting and computing machines of the class in which numeral keys are caused to set up computation pins, a general operator being subsequently employed to rotate dial wheels simultaneously to various extents determined by the said pins. A machine of this type is disclosed. in the pendin application of Frederick A. Hart, No. 466,836, filed December 10, 1908. In said machine the principal members of the computing mechanism are placed in a casing and a typewriting machine is mounted upon said casing.

One of the objects of my improvements is to avoid the necessity of elevating the typewriting machine to the extent heretofore practised in such machines, so that the keyboard will occupy about the same position with reference to the table on which the typewriter stands, as is the case with an ordinary typewriter having no computing attachment. To this end I mount the dial wheels at the front of the typewriter just over the keyboard, and the racks which operate the wheels extend backwardly alongside of the typewriter. The general operator is of simple structure and mounted beneath the racks. The dial wheels are hence placed where they are easily read, and the racks are compactly mounted and easily accessible, while the general operator handle is in a convenient position for manipulation; and the cost of manufacture of the computing attachment is greatly reduced.

The denomination selecting mechanism is very much simplified and reduced in cost, owing to the proximity of the pin-carrying racks to the typewriter carriage which selects the racks upon which the pins are to be set.

In the Underwood-Hanson combined typewriting and computing machine which is illustrated in said Hart application, when Specification of Letters Patent.

Patented June 6, 1916.

Serial No. 685,652.

it is desired to employ two or more sets of computing wheels, it is also necessary to provide a separate set of wheel-operating racks and connections to the typewriter carriage for each set of dial wheels. According to the present improvements, several sets of dial wheels may be arranged along the front of the typewriter and placed upon a carriage which may be adjusted from time to time to cooperate with the wheel-driving racks aforesaid, so that several sets of computing wheels may be very inexpensively, compactly and conveniently arranged upon the machine to be driven by a single set of pins. The invention also includes improved means for effecting subtraction whenever desired upon any of the computing wheels mounted on said carriage.

The movements of the computer carriage are preferably taken care of automatically, so that when writing and adding several. columns on a page simultaneously, the number set up by the computation pins is carried into the computing wheels, and the computer carriage is advanced to bring the next set of computing wheels intoplay before be ginning the writing of the next number on the line on the work sheet. Upon returning the typewriter carriage, the computer carriage is also automatically returned, so that a new line of writing and computation may be begun.

The denomination selecting mechanism includes a novel denomination transposing device which is applicable to other machines also.

Other features and advantages will here iuafter appear.

In the accompz-inying drawings, Figure l is a perspective front view of the computing mechanism applied to an Uncle wood front strike typewriting machine. Fig. 2 is a part sectional side elevation of the typewriting and computing mechanism, showing the arts in normal positions. F 1g. 3 1s a front elev tion of the achine. Fig. l is a plan of the computing devices, showing their relation to the typewriting machine. Fig. 5 is part sectional. plan of the key-driven computing lever, etc. Fig. 6 is sectional front elevation of the key-driven linkage to illustrate the manner of setting a computation pin. Jig. is a view similar to Fig. 6, but showing the keydriven linkage as elevated to set the pin. Fig. 8 is a rear elevation of the denomination selecting and transposing mechanism. Fig. 9 is a front elevation, showing the computer carriage returned to the right for the beginning of a new line of computation. Fig. 10 is a sectional elevation of the clutch forming part of the general operator of the computing mechanism. Fig. 11 -is a sec tional front elevation illustrating the handle which may be shifted to set the machine for either addition or subtraction, and the parts controlled by said handle. In Figs. 12 to 1% the parts are set for subtraction. Fig. 12 shows the general operator as having begun its stroke and shifted the dial wheel drivers into position for effecting subtraction. Fig. 13 corresponds to Fig. 12, but shows the parts as having advanced be yond the Fig. 12 position. Fig. 1st is a sectional plan of the parts seen at Fig. 11. Fig. 15 is a sectional side elevation to illustrate the normal position or the plate which returns to normal positions the key-set pins. Fig. 16 shows how said plate depresses the pins. Figs. 1'? to 2 1 are diagrammatic views of duplex spurs for rotating the carry-over trains in opposite directions. Fig. is a sectional elevation to show a. dial wheel, a computing train and a double set of spurs for driving the carryover trains; the movements of the parts for addition being shown by arrows. This figure shows the normal positions of the parts. Fig. 2G is similar to Fig. but shows the carry-over train as having been started by a tooth on the dial wheel. Fig. 27, 2S and Q9 correspond to Figs. 12 and 1, but show the machine set for addition. Fig. 27 shows th general operator as having lifted. the racks into mesh with the computation pinions. Fig. 28 shows the positions of the parts at the completion of the tt'orwart stroke of the general operator. Fig. 29 shows the normal positions of the parts. Fig. 30 is a sectional view of parts of some dial wheels and their appurtenances. Fig. 31 is a sectional elevation of certain portions of the mechanism whereby the general operator moves the drivers into mesh with the computation pinions for either dition or subtraction.

Alphabet keys 1 and numeral keys 2 depress levers 3, to rock bell cranks 1. which swing type bars 5 to print upon a platen 6. The platen is mounted upon a carriage 7, which, usual in the Underwood typewriting machine, is driven by a spring barrel S. The step-by-step or lettcrieeding movement of the carriage is controlled by dogs 9. which are operated by a universal bar 10. actuated by heels 1 on the type bars.

The nume 'al key-levers have pendent nrlin.

links 1'2, pivoted at their lower ends to levers 13 ot' the first order, fulcrumed at 1 1 upon fixed brackets 15. These levers extend toward the right of the keyboard, Fig. 5. and at their outer ends are pivoted to the bottom ends of upstanding links 16, to thrust the latter up as the keys descend. The links 16 may have returning springs 16, and may bein a row parallel with the key levers at Fig. 5. and the levers 13 may be of assorted lengths; and the links 12 may be disposed in a diagonal row so as to give clearance; while the fulcrums 14: may be so placed that the thrust links 16 are given equal movements. It is ob 'iously not essential to place the levers 13 diagonally; and it is also apparent that keys may be otherwise connected to links 16. These links 16 are connected at their upper ends with a set or nest of linkages intended to set up the computation pins. Each linkage comprises a horizontal pin-setting bar 17, to which the upper end of its link (3 is pivoted at 18, Fig. 6. This horizontal bar or link 17 is pivoted at its ends upon a pair of hell cranks 19, L0, which are connected by a link 21, so that said link 1'? is given a parallel movement up and down. Then one of these links 17 is thrust up, it one of its computation pins in the manner indicated at Fig. T.

The computation pins are arranged in eight rows of nine pins each, one row being mounted upon ach bar The nine bars carry their forward ends racks 24, for communicating movement to nine dial wheels arranged at the front of the machine about in a level with the typewriter carriage. where they may be easily read.

It will. be seen that these computation racks or bars are compactly mounted at one side of the frame of the typewriting machine. preferably at the right-hand side, and that the links 16, as well as the pinsetting linkages. are all compactly placed under the rack bars 23, and connected by simple devices to the keys; whereby great economy oi room is eii'ected and the necessity of unduly elevating the keyboard of the machine is avoided. When the computation racks 23 are in normal positions, they are out of reach of the pin-setting linkages 17; and provision is made whereby the typewriter carriage 7 depresses the computing racks or bars serz'atim, so that the linkages may set the pins thereon.

From a rod 26, fixed or mounted on the carriage, extends rearwardly pair of arms 2'7, carrying a rack 28, along which are independentl adjustable several dogs 29, in position to engage, one after another, a series of rock-arms 80, which are loosely mounted upon a fixed shaft 31, and each connected by an integral bail 32 to a forwardly-extending arm 33, the latter having at its forward end a pin 3-l, engaging a horizontal slot in a computation bar 23; the slot permitting the pin to raise or lower the rear end of the bar, without interfering with the longitudinal movement thereof which occurs at the operation of turning the computing wheels. The dog 29 may vibrate any arm 30 and hail 32, together with that arm 33 which is preferably integral with the bail 32 and arm 30, so that the pin-carrying bar is swung down to enable any of the linkages 17 to thrust up the overlying pin, see Figs. 6 and 7.

It will be seen at Fig. 8, which is a rear elevation, that the denominational order of the arms 30 is the reverse of the denominational order of the arms 33, all the bails being nested one within another as shown, to form a denomination-transposing device, so that while the operation of the arms 30 proceeds toward the right at Fig. 8, the operation of the arms proceeds toward the left, at said figure, so that as the can riage proceeds in letter-feeding direction. the computation bars 23 will be depressed in the proper order beginning *ith the highest denomination, since it is the arm 30' of highest denomination which is first rocked by the carriage-dog 29.

From the foregoing, it will be seen that at the completion of a letter-feeding movement of the typewriter carriage, one of the pin-carrying rack bars is depressed, and that at the ensuing stroke of a numeral key a computation pin is lifted upon said rack or bar, so that said pin will project above its fellows when the bar is returned to its normal elevated position. In this manner, the pins are set up one after another, as the number is written upon the work sheet which is carried upon the platen. At the completion of the writing of the number, the operative pulls forwardly a handle 36 on an arm 37 which extends from a rock shaft 38. The latter also carries an upstanding arm 39, which forms part of the general operator of the computing mechanism, and the'principal function of which is to rotate the dial wheels 25 as determined by the computation pins which have been set up by the keys 2. At the initial part of the forward stroke of the general operator 39, the computation racks 24 (when performing addition) are shifted up into mesh with pinions 40 fixed one to each of the dial wheels 25. It will be seen that the racks 24 preferably stand normally well below the dial wheels 25, to permit the latter to travel with the computing carriage upon which they are mounted. as will presently be explained. This shifting of the racks 24, up into mesh with the pinions, is effected through the instrumentality of a horizontal driver 41, pivoted at its rear end. a rock shaft 42, to which is also pivoted the 11 e1' end of a rm 39 and extendin forwardly and carrying on its forward end a rack 4-3, which meshes with an idle pinion ll, the latter meshing with a pinion -15 on a shaft '73, which carries a. wick-controlling disk 4-7, provided with a cam 48. This cam forms one side of a notch cut in said disk. This notch is normally occupied by a finger l9, carried upon an arm 50, whch extends up from a rock shaft 51 mounted in the framework of the machine. Forwardly from said rock shaft 51 extend two arms 52, united by a shifter bar 53, which passes through. horizontal slots 5% in all the racks 24-, whereby said bar may shift the racks up into mesh with the computation pinions 4-0. and down to normal position.

Sufficient rotation of the disk at? is effect ed to cam the finger 49 out of the notch 48, and thereby lift the racks 24, before the latter advance longitudinally. The positions of the parts at this moment are seen at Fig. 27. The racks 24; are now in mesh with the computation pinions 1-0, in which position they are held or locked by reason of the engagement of linger (it) with the cylindrical or unmutilated per hery of the disk 47. A horizontal cross-bar forming part of the general operator, new advances to engage all of the computation pins which have been set up by the keys 2, and to advance the computation racks accord ingly during the remainder of the forward stroke of the general operator arm 39; whereby the pinions a l) and dial wheels are rotated accordingly, to add upon. the dial. wheels the number which has just been written upon the w rk sheet.

The rack-advancing bar is carried by a pair of arms 170, seen in plan at Fig. 4 which are fixed upon a rock shaft carried in a fork 57 formed upon the upper end of the general-operator arm 39, Fig. l: the driving bar or rack 4-1 aforesaid being loose on. said rock shaft, and normally supported at its forward end on a guide roll 58 which is placed directly beneath pinion 44, Fig. 2. The rack-advancing bar may rest directly upon the racks, and may be swiveled at 59 to its driving arms 56, to accommodate itself to the slight inclination of the rack as they rise into mesh with their pnncns. A. spring 60 may be provided. upon the rock-shaft 1-2, to hold the bar 55 lightly down upon the racks.

The dial wheels 25 having thus been rotated, and the general operator having completed or so stantially completed its fen ward stroke, the racks 21- are dropped. out of mesh with the pinions. preparatory to beginning their return strokes to normal positions. This unmeshing is caused by the rack-controlling finger 4'9 falling again into the notch in the cam disk the other wall of said notch being designated as 61, and

t it will be traders .illed dovin by te L ed by an adjustable stop 62, arter dropped: and t the racks 24- lave hat theretiye lifts said handle and reupon the op g neral operator to normal -Jr another computation. Durreturn stroke, the racks 2i: ride bacltwardly upon the guides 53, without tin l ng any Wheels. A. spri (32 may either i ect or assist the return (a: die general op- (*iuufil'.

Luring the return stro e ot the general operator, the cam disk :37 m: ns stationary, being held against rotation by the finger 2e 49 which occupies the notch and serves as a detent: a spring 33 Fig. 3), coiled around the rock shaft 51, aiding the \veigl t ot the racks in maintaining said finger i9 against displacement. The pinion L5, however. is

2-5 also emplo ed for driving tens-carrying t1flln,. and for this pui l i, m ltmakes a single rerolut'on in reverse (Ll action during the 'eturn stroke of the general operator. To pe mit this r turn stroke while cam s the can: disk 1' a compl te revolution in the same direction, for the purpose already explained.

l he rack-advancing bar during the return motion of the general operator 39, engages lugs 69 formed on the computation bars 2?). and rcstor s them to nor tions. The bar may 50 beveled on its rear e se at T0. to enable it to ride over any pins 4- which may be accidentally set up while the general operator is in the abnormal 28 position.

Upon each of the dial wheels (except the vvhcel of highest denomination) is a tooth T 1. to start the ciated tens-carr v ing train. which comprises Q-t-ooth pinion engageablo by tooth T1 and rotated thereby through one-ninth of a revolution. The 69 normal position of: the tens-carrying train g. while the position to i een at l YflllCll it is turned by tooth T1, is seen at iipon a shaft 73, which carries the p nion are placed eight spurs or segments T-l, which are rotated in clockwise however, any pinion 72 has been started, as 5 at 2c, the ensuing movement of the associated spur T iirill rotate the pinion 1% 1 through two-ninths of a revolution; making one-third of a revolution in all.

To each pinion 72 is fixed a three-toothed 3o pinion 76, to turn into mesh with and advance for one-tenth of a revolution a tentoothed gear 77, which is fixed to the dial Wheel 25 of next higher denomination, there by carrying 1 over to the last-mentioned dial Wheel. The shaft 73 is motionless during the advance stroke of the general operator, because it has a clutch connection to the pinion 45, (see Fig. 10). In a hub 78 mounted on the shaft, is a pocket 79 to receive a spring 80 and a ball 81, the latter being pressed into a recess 82 in the pinion 15; the construction being such that the pinion may turn freely in one direction for a full revolution, but during its back stroke Will turn the shaft a full revolution. A notched disk is provided upon the spur-shaft 73, a spring detent St normally occupying the notch to hold the shaft and the spurs thereon in normal positions.

will thus be seen that during the return stroke of the general operator, the carry over trains are operated wherever necessary; this carry-over mechanism corresponding generally with that disclosed in the application of Frederick is. Hart, No. 466,836, dated December 10, 1908. During the final portion of the return stroke of the general (Pperator, the computation pins 22 which vere originally projected, are restored to normal positions by means of a plate 85, overlying the pins and fixed upon a pair of arms 86, which extend forwardly from a rock shaft 87 jonrnaled in the side plates 88, S9, of the framework, and extending between the same, said plates being fixed to the main frame of the typeivl'iting machine at one side thereof. Rearwardly from said rock shaft extends an arm 90, having at its rear end a bevel 91, Which is engaged by a cam or tappet 92 on the fork 57 of the general operator arm 39; whereby the arm 90 is cammed up, and the plate 85 is swung down to depress all of the projected pins 22 to their normal positions. The cam or tappet 92 finally escapes from the cam 91, Fig. 16, and a pring 93, Fig. 4c, lifts the pin-restoring plate 85 to normal position, as at Fig.

During the forward stroke of the general operator, the tappet 92 (Fig. 15) passes 1 freely by the cam 91, the former being pivoted at 94 to the general operator arm, to permit it to yield. A spring 95 thereupon restores the tappet 92 to normal position, resting against a stop 96 on the general operator arm.

At the subtraction operation, Figs. 12, 13, the computation racks are not shifted up; the cam disk 47, which controls the elevation of said racks, remaining stationary. The racks are connected to the computation pinions 40 for subtraction purposes by means of floating or idle pinions 100, which are antomatically shifted forwardly from their idle positions at Fig. 27 to the Fig. 12 position in mesh with said pinions 40. This shifting of the subtraction pinions 100 is effected by a disk 101, having a cam notch 102 normally occupied by a finger 103, fixed upon a rock shaft 104, the latter also carrying a pair of arms 105 which are pivoted at 106 to a pair of forwardly extending links 107, which carry at their front ends a crossshaft 108 upon which all the subtraction pinions 100 are loosely mounted. During the initial part of the forward stroke of the general operator to the Fig. 12 position, before the racks 24 start forward, the cam 102 raises the finger 103, rocks the shaft 104 and arm 105, and draws rearwardly the links 107 together with the pinions 100, the latter running idly upon the racks 24 and meshing. with the pinions 40. During the remainder of the forward motion of the general operator, the dial wheels 25 will be rotated reversely, so as to subtract the amounts represented by the pins 22 that have been set up by the keys. A controlling handle or device 109, seen at Fig. 3 in addi tion position. may be swung to the right, to the position seen in dotted lines at Fig. 11 and in full lines at Fig. 14, to set the ma.- chine for effecting subtraction. Rigid with this handle or lever 109 is an arm or shoulder 110, which stands in idle position when the machine is adding, but which may be swung down, as at Fig. 31, to strike an arm 111 on the pawl 64 to release the same, so that the clutch disk 67 may revolve idly or without stirring the addition cam disk 47 Upon the subtraction cam disk 101 there is pivoted at 112 a. pawl 113, to engage a shoulder 114 on a clutch disk .115, which is positively connected to the pinion 45 by pins 116, Fig. 11. By this means the cam disk 101 is given an entire revolution during the forward stroke of the general operator at the subtraction operation, to bring the subtraction pinions 100 into use and hold them in their effective positions during the advance of the computation racks 24. At the conclusion of the revolution of the cam disk 101, the finger 103 snaps into the notch 102 in disk 101, and engages the abrupt wall 117 thereof, this movement being effected by a spring 118, whereby the pinions 100 are returned to their normal position, Fig. 27. The computation racks 24 may now, of course, be returned freely to normal positions without rotating the dial wheels 25.

It will be understood that the two cam disks 47 and 101 do not rotate simultaneously; or 111 other words, when elther one is in use, the other one stands idle. It has already been explained that when the machine is set for subtraction, the shoulder releases the clutch pawl 64 of the addition cam disk 47. lVhen the machine is set for addition, however, the pawl 64 is active, but the subtraction pawl 113 is released, owing to the engagement of a pin 119 thereon by a tail 120 on the addition pawl 64, see Fig. 28; said tail having a cam edge 121 to engage said pin 119, and release the subtraction pawl 113 at each completion of the rotation of addition disk 47. Thus, though the two clutch disks 67 and always rotate together at the forward stroke of the general operator, still only one of the cam disks (47 or 101) is in use at any time.

During the advance of the general operator, the clutch disk 115, Fig. 31, rotates to the left and drives the cam disk 101 accordingly for a full revolution; but during the return stroke of the disk 115, the cam disk 101 is stationary, and the pawl 113 rides idly upon the edge of the disk and finally snaps behind the shoulder 114 thereon, due to the pressure of a spring 113 associated with it. A similar operation takes place with respect to pawl 64 and clutch disk 67, when the machine is set for addition.

During the reverse rotation of the dial wheels 25 when subtracting, the starting teeth 71 thereon, may start the respective carry-over pinions 76 in the reverse direction from that shown by the arrow at Fig. 25; and during the ensuing return stroke of the general operator, the set of subtraction spurs 122, Fig. 25, is brought into action, to complete the rotation of the tens-carrying trains in reverse direction, so that each may make a full third of a revolution and thereby turn the next higher computing wheel 25 reversely a single point, or in other words, borrow 10 from said higher computing wheel.

The spurs 122 may be upon the same shaft 73 as the spurs 7 4, and the latter may rotate idly during the operation of borrowing tens. Both the addition spurs 74 and the subtraction spurs 122 are placed spirally along the shaft 73, so that the spurs in either set will act one after another upon the tens-carrying trains, as set forth in my application No. 658,958, filed November 7, 1911.

The shifting of the handle 109 from the addition position at Fig. 3 to the subtraction position at Fig. 14, has the effect of reversing the connection between the general driving pinion 4E5 and the spur shaft- 73, so that the latter rotates reversely when actuated by the pinion 45 at the return stroke of the general operator. The shaft-reversing mechanism comprises bevel pinions 123, 12-1, 125, forming a train, the pinions 123 and 125 being loose on the shaft '73, and connected by 121. The hub 78 (seen at Fig. is formed upon the pinion 123, so that said pinion may always be revolve-d in the same direction during the return St10{ of the pinion i5. At Fig. 11, a double headed clutch member 126, which is splined at 12 7 to said shaft 73, is shown clutched to the pinion 193, the latter having an internal clutch-member or ratchet 128, to match one end of the double clutch member 126, so that the shaft 7 3 is turned positively in the direction for addition, or clockwise at lg. 25. hen said handle 109, (which has pins 130 to engage a groove 131 in said double-headed clutch 126) is swung to the subtraction position at Fig. 11-, the other clutch head on said double clutch engages an internal ratchet 132, formed on the pinion 125, so that the latter drives the double clutch, and hence the shaft 7 3, in the reverse direction.

Many of the parts so far described, are mounted on shafts or arbors which are supported in the side plates 88, 89 of the fixed computing frame. If desired, the lower part of the plate 89 may be set inwardly for compactness, as seen in dotted lines at Fig. 3, and in full. lines at Fig. 1.

T he 11 echanism so far described relates to a single computing head. One of the fea tures of the invention, however, is the provision of a simple and efiicient mechanism for computing upon any of a plurality of computing heads. This is one reason why the computing racks E i are placed at the upper part of the machine, where the computing wheels may be in position for corn venient actuation by said racks, and at the same time may be placed upon a special carriage which may be simply connected to the carriage of the typewriter, or readily caused to cooperate therewith. The five sets of con'iputing wheels illustrated, (more or less than five may be used), are shown placed upon such separate carriage, which may consist of a horizontal bar 135, arranged in front of the typewriting machine at the back of the keyboard, and supported in a guide groove formed by a back plate or rail 136 and front plate or rail 13?, the latter bent under the carriage bar 135, Fig. 2, to form a rail or track for supportin the same, as at 138. From the said bar 13:) rise arms -39, 1 .0. the upper ends of which are bent forwardly to form ears 141-1, 1 12, which are rigidly connected by a long horizontal tierod 113, which forms an arbor for all of the dial wheels; the latter being divided into heads, which. are separated by washers or collars 11% placed on the arbor 143. This computing carriage 135 may slide in the same direction as the typewriter carriage, and for nearly the same length of travel. It will be seen at- Fig. 2 that the dial wheels and other portions of the carriage are clear of the computation racks, the carry-over trains, and the subtraction pinions; so that said computing carriage i'nay be adjusted freely along its track; while only one set of operating racks, carry-over trains, and subtraction pinions, with their appurtenances, needs to be brovided; all of these being mounted upon the machine frame in position to act upon any computing head that may be presented thereto.

It will be understood, of course, that the computer carriage remains stationary during the writing of all the digits of a number, that is. during a limited portion of the travel of the typewriter carriage; and for this reason, the two carriages are not positively connected. The movements of the computer carriage are preferably automatic, and for this reason said carriage may be driven by a spring, as for instance that con tained in a barrel 115 pivoted upon the framework of the typewriter, and connected by a strap 1&6 to a bar or rack 14'? that is fixed to the computer carriage.

The computer carriage is normally held against advancing by a feed-pawl or dog 1&8, pivoted at 1 13) upon the machine framing, to enga e any of a series of teeth 150 formed on tne rack or bar 117, at intervals to agree with the intervals between corresponding dial wheels of successive computing heads; said pawls being pressed down by a spring 151. This rack fixed upon a cover plate 152, which extends from end to end of the computer carriage, and overhangs the computation wheels, being provided with sight openings 153.

The cover plate is supported between its ends by lugs 15%, which project up from a tie-rod 155, extending from ear 1&1 to ear 142 of the computer carriage. Upon this tie-rod may also be pivoted spring detents 156 for the dial wheel gears 77.

lVhenever the tvoewriter carria 'e has= moved out of one computing zone, and before it moves into another, the detent dog 113 is tripped by means of one of a series of tappets 157 depending from collars 158 ad justably mounted upon a rod 159, the latter secured at its ends in lugs 160 fastened to the front of the typewriter carriage. Any of these tappets 157 may engage a cam 161 on an arm 162 provided on said detent dog 1&8, and by depressing said cam, may lift said dog MS from the tooth 150 engaged thereby, and thereby release the computer carriage, so that it may be drawn rapidly to the left by the spring1 15, until arrested by engagement of the succeeding tooth 150 by said dog 118, which is quickly snapped down by the spring 151; the movement of said cam 161 by the tappet 157, and the escape of the latter, both preferably occurring during a single letter-feeding movement of the typewriter carriage, so that the action of dog 118 may be prompt in resum ing normal position and engaging the succeeding tooth 150. The last feeding movement of'the computer carriage is arrested by the engagement of arm 139 with a stop 163 provided upon the left-hand end of rail 137, Fig. 3. The tappet collars 158 are adjustably secured along the rod 139 by means of screws 164, so that the timing of their action may be made accurate; and the same is true of dogs 29.

It will be seen that a line of numbers may be written across the machine, and each number may be carried into the corresponding computing head, (being either added or subtracted. from the number previously shown on said computing head), the movements of the computer carriage being auto matic.

Upon the return of the typewriter carriage to normal position by means of the usual line-space lever 165, Fig. 1., an arm 166, also fixed on the carriage rod 159, engages the car 111 of the computer carriage, and drives the latter toward the right at Fig. 3 back to initial position, for beginning the writing and, computation of a new line.

The arm 166 may project forwardly to clear the strap 116 and the dog 1 18, and may engage the forward part of the ear 141 of the computer carriage. The typewriter carriage will return the computer carriage to the position at Fig. 9, so that said dog 1 18 may engage the first tooth 150 on the rack. Thus all of the movements of the computer carriage may be effected without special attention on the part of the typist; and the several computations will automatically be performed upon the appropriate computing heads. Provision may also be made for supporting or guiding the computer carriage at its upper portion, this device being in the nature of a horizontal guide rod 167, which is fixed to a turned-down forward ledge 168 formed on a plate 169, which is secured to a fixed bar 170 forming part of the front framework of the typewriter. This guiding rod is of a length to span the distance between any two guide ears 171 erected upon the computer carriage at the same intervals as the computer heads, each guide ear having a slot 172 in its top, so as to clear the bent-down ledge or flange 168. Each end of the guide rod may be pointed as at 173. to facilitate the introduction thereof into the cylindrical guide openings 171 on the ears 171. The guide rod 167 is prefe ably placed adjacent or directly above the dial wheels, so as to support the computer carriage directly at the point where the which the rear end of a link 18? is attached; the ard e1 oi; the nnk being pivoted at 181 to the arm 39 of the general operator. The motor, worm and gear may be substantially in accordance with the devices shown in the application of Frederick A. Hart, No. 596,451, filed December 9, 1910; and, as also shown in the same application, a key 185 may be employed for causing the worm gear to become clutched to the disk 181, or to the shaft 186, so as to give the latter a single revolution; said key being connected to a lever 186, having at its rear end a clutchcloser 187 of the kind substantially set forth in said Hart application 1 0. 596,151.

In order to permit the handle 36 to be used when desired. the driving disk 181 may have a diamctrical slot 188 and the wrist 182, whereby link 183 is connected to said disk 181, may ride freely to and fro in said slot; but when it is desired to use the motor, a screw 189 may be tightened to fasten the wrist firmly to the disk 181 in the Fig. 2 position, so that the disk may reciprocate the general operator. Either this form or any other form of driving mechanism for the general operator may be conveniently mounted behind the typewriting machine, thus making a compact structure, and avoiding the necessity of placing bulky parts beneath the typewriting machine, and perhaps necessitating the elevation of the typewriting machine too far above the work able.

It will be noticed at Figs. 2 and 8 that returning springs 190 are provided for the denomination selecting arms 33; and that a stop plate 191 is arranged above said arms to limit their return movements; said plate having guide slots or notches 192 for the rear ends of the racks 23. The handle 109, which sets the machine for either addition or subtraction. is provided with a spring detent 194-, Figs. 3 and 1-1, which. engages either of two notches 195, 196 in a fixed plate 197, to hold the handle 109 in either position. A spring 198, Figs. 12 and 13, pulls down the arms 107 to hold the subtraction pinions 100 in mesh with the driving racks 21.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

\ a carriage in real or with a typewriting i at its front, and yboard, said keyboard including numeral keys, of computing devices at one side of the typewriting machine adjacent to the Jewriter car lace and ha ing denominational members controlled by s. id carriage, said computing deices including a system of pins, a system of computing heels, and a general operator for driving the wheels eacn to an extent determined b said pins, mea tor setting the pins. and connections from said keys to said pin-setting means.

2 The combinatio. wit 1 a typewriting machine having a keyboarc at its front, and a carriage in rear of the keyboard, said keyboard including numeral keys, of computing devic s at one side of the typci ritin machine adiacent to he typewriter carriage and hav denominational members controlled l carriage, said computing dei no machine having a keyboarc at its trout, and a carriage in rear of the keyboard. said keyboard including numeral keys, of computing devices at one side of the type riting machine adjacent to the typewriter carriage and having denominational members controlled by said carriage, said computing dea. a cm of pins, :1 system of computingwheels, and a general operator tor driving the wheels each to an e::tent deternincd by said pins. nun eral key levers, links pendent therefrom. sub-lever? to which said links are pivoted at their lower ends, upstanding: thrust links connected to the opposite ends of said sub-levers from said pendent links. and pin setting' devices connected 0 said thrust links at their upper ends. said hrust links forming a row parallel. with. the key levers. and said sub-levers being 01. assorted lengths. said pendent links disposed in a, diagonal row, and the fulcrums of said sub-levers being; so placed that the thrustlinks are given equal movements.

1. The combination with a tyi iew 'itingr machine having a eyboard at its front, and a carriage in rear of the keyboard, said keyboard including numeral keys, of computing devices at one side of the typewriting machine adjacent to the typewriter carriageand having denominational members controlled by said carriage, said computing devices including a system of pins, a system of computing wheels, and a general operator tor driving the wheels each at an extent determined by said pins, numeral key levers, links pendent therefrom, sul'J-lcvers to which said links are pivoted at their lower ends, upstanding thrust links connected to the opposite ends of said sub-levers from said pendent links, and pinsetting linkages operated by said thrust-links and including each a horizontal bar to which the upper end of the corresponding thrust-link is pivoted, said thrust links forming a row parallel with the key levers. and said sub-levers being 01": assorted lengths, said pendent links disposed in a diagonal row, the tulcrums of said sub-levers being: so placed that the thrust links are given equal movements.

5. The con'1l: ination with a typewritinp; machine having a keyboard at its front, and a carriage in rear of the keyboard. said keyboard includingnumeral keys, of computing devices at one side of the typcwriting machine adja cut to the typewriter carriage and having (lemmiinational members controlled by said carriage, said computing devices including a system of pins, a system of computing wheels, and a general operator for driving); the wheels each to an extent delei-mined by said pins, numeral key levers, links pendent therefrom. sub-levers to which said links are pivoted at their lower ends, upstanding thrust links connected to the opposite ends of said sub-levers from said pendent lin and pin-setting; linkages operated by said thrust-links and including each a horizontal bar to which the upper end ot the corresponding thrustdink is pivoted, said linkages arranged beneath the system o-t pins. and arranged to thrust up any pin the latter to turn the computing whee s' 6. The combination with a typewriting machine having a keyboard at it front, and a carriage in rear of the keyboard, said keyboard includinp; numeral key", of computing devices at one side of the typewriting machine adjacent to the typewriter carriage and having denominational members controlled by said carriage and extending forrardly and rearwardly at the side of the machine, said computing" devices including a system of pins carried by said denominational. members, a system of computing wheels, and a, general operator for driving the wheels each to an extent determined by said pins, means for setting the pins, and connections from said keys to said pinsettine means. said computing wheels being located at the front of the typewriting machine about on a level with said carriage and having means whereby they may be r0- tated by said denominational members.

7. The combination with a letter-feeding carriage, of a set of computing wheels or devices, a general operator for advancing said wheels, key-controlled means, including a set of denominational devices, for de termining the extent to which the wheels shall be advanced by said general operator, and a denomination-transposing device extending from said denominational devices to said carriage, to enable the latter to select the denomination of the wheels to be actuated, said transposing device comprising a set of bails each having at one end means to be operated by the carriage and at the other end means connected to the denominational devices, said bails being of assorted sizes and nested one within another, whereby the transposition of the denominations is effected.

8. The combination with a typewriting machine having a keyboard at its front, and a carriage in the rear of the keyboard, said keyboard including numeral keys, of computing devices at one side of the typewriting machine adjacent to the typewriter carriage and having denominational. members controlled by said carriage, said computing devices including a system of computing Wheels, a system of pins, means for setting the pins, connections from said keys to said pin-setting means, and a general operator comprising an upstanding arm beneath said computing devices, means carried by said arm at its upper end for engaging the pins to drive the wheels, and an operating arm.

9. The combination with a typewriting machine having a keyboard at its front, and a carriage in rear of the keyboard, said keyboard including numeral keys, of computing devices at one side of the type-writing machine adjacent to the typewriter carriage, said computing devices including a system of computing wheels, denominational com puting racks controlled by said carriage, said racks normally out of mesh with said wheels, key-set means for determining the extent of movement of said racks, and a general operator comprising an upstanding.

board including numeral keys, of computing devices at one side of the typewriting machine adjacent to the typewriter carriage,

said computing devices including a system of computing wheels, denominational computing racks controlled by said carriage, said racks normally out of mesh with said wheels, key-set means for determining the extent of movement of said racks, and a general operator comprising an upstanding arm beneath said computing devices, means carried by said arm at its upper end for enabling the racks to drive the wheels, a driving rack pivoted at one end to the upper end of the first-named arm of said general operator, an idle pinion with which said driving rack meshes, a second pinion meshing with said idle pinion, a dis; rotated by the second pinion and having a cam, and means controlled by said cam to shift said computing racks into mesh with the computation wheels.

11. The combination with a typewriting machine having a keyboard at its front, and a carriage in rear of the keyboard, said keyboard including numeral keys, of computing devices at one side *of the typewriting machine adjacent to the typewriter carriage, said computing devices including a system of computing wheels, denominational computing racks controlled by said carriage, said racks having slots therein and being normally out of mesh with said wheels, keyset means for determining the extent of movement of said racks, and a general oper ator comprising an upstanding arm beneath said computing devices, means carried by said arm at its upper end for enabling the racks to drive the wheels, a driving rack pivoted at one end to the upper end of said general operator arm and extending forwardly, an idle pinion. with which said driving rack meshes, a second pinion meshing with said idle pinion, a disk rotated by the second pinion and having a notch provided with a cam edge, a finger occupying said notch, a rock shaft upon which said finger is mounted, arms extending from said rock shaft, and a bar connected to said arms and extending through the slots in said computing racks to shift the same up and down.

12. The combination with a typewriting machine having a keyboard at its front, and a carriage in rear of the keyboard, said keyboard including numeral keys, of computing devices at one side ef the typewriting machine adjacent to the typewriter carriage, said computing devices including a system of computing wheels, denominational computing racks controlled by said carriage,-

said racks having slots therein and being normally out of mesh with said wheels, keyset means for determining the extent of movement of said racks, and a general operator comprising an upstanding arm. beneath said computing devices, means carried by said arm at its upper end for enabling the racks to drive the wheels, an operating arm,

a driving rack pivoted at one end to the upper end of the first named arm of said general operator arm and extending forwardly, an idle pinion with which said driving rack meshes. a second pinion meshing with said idle pinion, a disk rotated by the second pinion and having a notch provided with cam edge. a finger occupying said notch, a rock shaft upon which said finger is mounted, arms extending from said rock shaft, and a bar connected to said arms and extending through the slots in said computing racks to shift the same up and down, and said disk also having a cylindrical periphery to lock the racks in mesh with the computing wheels.

13. The combination with a typewriting machine having a keyboard at its front, and a carriage in rear of the keyboard, said keyboard including numeral keys, of computing devices at one side of the typewriting machine adjacent to the typewriter carriage, said computing devicesincluding a system of computing wheels, a system or" pins, denominational computing racks carrying said pins and controlled by said carriage, means for setting the pins, connections from said keys to said pin-setting means, and a general operator comprising an upstanding arm beneath said computing devices, and across bar hinged upon said general operator to engage all of the computation pins which have been set up by the keys and thereby advance the computing racks.

let. The combination with a typewriting machine having a keyboard at its front, and a carriage in rear of the keyboard, said keyboard including numeral keys, of comput ing devices at one side of the typewriting machine adjacent to the typewriter carriage, said computing devices including a system of computing wheels, a system of pins, denominational computing racks carrying said pins and controlled by said carriage, means for setting the pins, connections from said keys to said pin-setting means, and a general operator comprising an upstanding arm beneath said computing devices, a cross bar to engage all of the computation pins which have been set up by the keys and thereby ad vance the computing racks, a pair of arms carrying said pin-engaging bar, said upstanding arm of said general operator being forked at its upper end, and a shaft carried by said fork and to which said arms are pivoted or hinged.

The combination with a typewriting machine having a keyboard at its front, and a carriage in rear of the keyboard, said keyboard including numeral keys, of computing devices at one side of the typewriting machine adjacent to the typewriter carriage, said computing devices including a system of computing wheels, a system of pins, denominational computing racks carrying said beneath said computing devices, a cross bar to engage all of the computation pins which have been set up by the keys and thereby advance the computing racks, a pair of arms carrying said pin-engaging bar, said upstanding arm of said general operator being itorked at its upper end, and a shaft carried by said fork and to which said arms are pivoted or hinged; said pin-engaging bar being swiveled to its driving arms, and beveled upon its rear edge on its under side.

16. The combination, with a computer carriage. and a plurality of separate computing heads thereon, each computing head comprising a set of computing wheels, each of which is provided with a pinion; of a single set of racks. said carriage being arranged to travel relatively to said racks to bring any one of said computing heads into position to eo-act therewith; and. a general operator acting to initially shift said racks into mesh with the pinions o'l the computing head brought into such position, and to subsequently drive the meshed racks.

17. The combination, with a computer carriage, and a plurality of separate computing heads thereon, each computing head comprising a set of computing wheels, of a single set of racks, said carriage being arranged to travel relatively to said racks to bring any one of said computing heads into position to co-act therewith; a single set of carrvover trains for co-action with the com puting head brought into such position, said trains being normally out of the paths of the computing heads, so as to permit the movement of said carriage; and a general operator acting to initially shift said racks into position to coiiperate with the wheels of the computing head so positioned, and to subsequently drive the meshed racks, said general operator also having means for driving said carry-over trains.

18. In a computing machine, embodying computing devices, including a system oi? computing wheels, a system of pins, denominational members for driving maid wheels controlled as to their extent of movement by said pins, and key-controlled means for setting the pins, a general operator comprising an upstanding arm beneath said computing devices, means carried by said arm at its upper end for causing the drive of said denominational members and said wheels, and an operating arm; a plate overlyingsaid pins; and means controlled by said upstanding arms for swinging said plate down and upon the set pins to restore them to normal positions.

19, In a computing machine, embodying computing devices including a system of computing wheels, a system of pins, denominational members for driving said wheels controlled as to their extent of movement by said pins, and key-controlled means for setting the pins, a general operator comprising an upstanding arm beneath said computing devices, means carried by said arm at its upper end for causing the drive of said denominational members and the wheels, and an operating arm; a plate overlying said pins; a pair of arms on which said plate is mounted; a rock shaft upon which said arms are mounted; and a cam or tappet on said general operator to swing said arms and plate down upon the set pins to restore them to normal positions.

20. The combination of a set of computation pinions, a set of racks normally out of mesh with said pinions, a general operator for driving said racks, a set of normally idle subtraction pinions normally meshing with said racks, a finger-piece, and means connected to said finger-piece for causing said general operator, before driving the racks, either to shift said racks into mesh with said computation pinions or to shift said subtraction pinions along said racks and into mesh with said computation pinions.

21. The combination of a set of computation pinions, a set of racks normally out of mesh with said pinions, a general operator for driving said racks, a set of normally idle subtraction pinions normally meshing with said racks, a finger-piece, means connected to said finger piece for causing said general operator, before driving the racks, either to shift said racks into mesh with said computation pinions or to shift said subtraction pinions along said racks and into mesh with said computation pinions, and a set of carry-over trains and members also controlled by said finger-piece for determining whether said carry-over trains shall operate forwardly or backwardly, according as addition or subtraction is to be performed.

22. The combination of a set of computation pinions, a set of racks for operating the same either forwardly or backwardly, a general operator to drive said racks, a revoluble cam disk, means controlled by said disk for shifting said. racks into mesh with said computation pinions to perform addition, a pinion driven by said general operator, a clutch device between said pinion and said disk comprising a pawl, a fingerpiece h aving shoulder to release said pawl, a second cam disk called into action by the movement of said finger piece, and. means controlled by said second cam disk for causing subtraction to be performed by said con'iputing pinions at the movement of said general operator.

23. The combination of a set of computation pinions, a set of racks for operating the same either forwrrdly or backwardly, a general ope 'ator to drive said racks, a revoluble cam disk, means controlled by said disk for shifting said. racks into mesh with said computation pinions to perform addition, a pinion driven by said general operator, a clutch device between said pinion and said disk comprising a pawl, a finger-piece having a shoulder to release said pawl, a second cam disk called into action by the movement of .'aid finger-piece, means controlled by said second cam disk for causing subtraction to be performed by said mmputing pinions at the movement of said general operator, and a carry-over mechanism connected to said general operator and reversible by said finger-piece.

2-1:. The combination with a set of compuw tat-ion pinions, of racks normally out of mesh with said pinions, a general operator for advancing said racks, key-set means for determining the extent of rotation of said pinions, a set of normally idle subtraction pinions meshing with said ltltli'fi, and shiftable means for enabling the jeneral operator either to shift said racks into engagement with said computation pinions, or to shift said subtraction pinions along said racks into mesh with said computation pinions.

The combination with a. set of computation pinions, of racks normally out of mesh with said pinions, a general operator for advancing said racks, key-set means for determining the extent of rotation of said pinions, a set of normally idle subtraction pinions meshing with said racks. shiftable means for enabli. the general operator either to shift said racks into engagement with said (70411}711t21i1i011 pinions or to shift said subtraction pinions along said rack, into mesh. with said computation pinions, said shiftable means including a disk driven by said general operator and having a cam, a finger operated by said cam, a rock shaft for said finger, a pair of arms upon said rock shaft, a pair of links pivoted to said arms, and a cross bar carried by said links: said subtraction pinions mounted upon said cross shaft.

The combination witl'i a set of com tation pinions, of racks normally out mesh with said pinions, a general. operator for advancing said racks, key-set means for determining the extent of rotation of said pinions, a set of normally idle subtraction pinions meshing with said racks. shiftable means for enabling; the general operator into engagement either to shiit said racks with said computation pinions or to shift said subtraction pinions along said racks into mesh with said computation pinions, said shiftable means including a disk driven by said general operator and having 

